from typing import Dict, Optional, Any, List
from types import ModuleType
import importlib
import sys
import gradio

import facefusion.globals
from facefusion import metadata, logger, wording
from facefusion.uis.typing import Component, ComponentName
from facefusion.filesystem import resolve_relative_path

UI_COMPONENTS: Dict[ComponentName, Component] = {}
UI_LAYOUT_MODULES : List[ModuleType] = []
UI_LAYOUT_METHODS =\
[
	'pre_check',
	'pre_render',
	'render',
	'listen',
	'run'
]


def load_ui_layout_module(ui_layout : str) -> Any:
	try:
		ui_layout_module = importlib.import_module('facefusion.uis.layouts.' + ui_layout)
		for method_name in UI_LAYOUT_METHODS:
			if not hasattr(ui_layout_module, method_name):
				raise NotImplementedError
	except ModuleNotFoundError as exception:
		logger.debug(exception.msg, __name__.upper())
		sys.exit(wording.get('ui_layout_not_loaded').format(ui_layout = ui_layout))
	except NotImplementedError:
		sys.exit(wording.get('ui_layout_not_implemented').format(ui_layout = ui_layout))
	return ui_layout_module


def get_ui_layouts_modules(ui_layouts : List[str]) -> List[ModuleType]:
	global UI_LAYOUT_MODULES

	if not UI_LAYOUT_MODULES:
		for ui_layout in ui_layouts:
			ui_layout_module = load_ui_layout_module(ui_layout)
			UI_LAYOUT_MODULES.append(ui_layout_module)
	return UI_LAYOUT_MODULES


def get_ui_component(name : ComponentName) -> Optional[Component]:
	if name in UI_COMPONENTS:
		return UI_COMPONENTS[name]
	return None


def register_ui_component(name : ComponentName, component: Component) -> None:
	UI_COMPONENTS[name] = component


def launch() -> None:
	with gradio.Blocks(theme = get_theme(), css = get_css(), title = metadata.get('name') + ' ' + metadata.get('version')) as ui:
		for ui_layout in facefusion.globals.ui_layouts:
			ui_layout_module = load_ui_layout_module(ui_layout)
			if ui_layout_module.pre_render():
				ui_layout_module.render()
				ui_layout_module.listen()

	for ui_layout in facefusion.globals.ui_layouts:
		ui_layout_module = load_ui_layout_module(ui_layout)
		ui_layout_module.run(ui)


def get_theme() -> gradio.Theme:
	return gradio.themes.Base(
		primary_hue = gradio.themes.colors.red,
		secondary_hue = gradio.themes.colors.neutral,
		font = gradio.themes.GoogleFont('Open Sans')
	).set(
		background_fill_primary = '*neutral_100',
		block_background_fill = 'white',
		block_border_width = '0',
		block_label_background_fill = '*primary_100',
		block_label_background_fill_dark = '*primary_600',
		block_label_border_width = 'none',
		block_label_margin = '0.5rem',
		block_label_radius = '*radius_md',
		block_label_text_color = '*primary_500',
		block_label_text_color_dark = 'white',
		block_label_text_weight = '600',
		block_title_background_fill = '*primary_100',
		block_title_background_fill_dark = '*primary_600',
		block_title_padding = '*block_label_padding',
		block_title_radius = '*block_label_radius',
		block_title_text_color = '*primary_500',
		block_title_text_size = '*text_sm',
		block_title_text_weight = '600',
		block_padding = '0.5rem',
		border_color_primary = 'transparent',
		border_color_primary_dark = 'transparent',
		button_large_padding = '2rem 0.5rem',
		button_large_text_weight = 'normal',
		button_primary_background_fill = '*primary_500',
		button_primary_text_color = 'white',
		button_secondary_background_fill = 'white',
		button_secondary_border_color = 'transparent',
		button_secondary_border_color_dark = 'transparent',
		button_secondary_border_color_hover = 'transparent',
		button_secondary_border_color_hover_dark = 'transparent',
		button_secondary_text_color = '*neutral_800',
		button_small_padding = '0.75rem',
		checkbox_background_color = '*neutral_200',
		checkbox_background_color_selected = '*primary_600',
		checkbox_background_color_selected_dark = '*primary_700',
		checkbox_border_color_focus = '*primary_500',
		checkbox_border_color_focus_dark = '*primary_600',
		checkbox_border_color_selected = '*primary_600',
		checkbox_border_color_selected_dark = '*primary_700',
		checkbox_label_background_fill = '*neutral_50',
		checkbox_label_background_fill_hover = '*neutral_50',
		checkbox_label_background_fill_selected = '*primary_500',
		checkbox_label_background_fill_selected_dark = '*primary_600',
		checkbox_label_text_color_selected = 'white',
		input_background_fill = '*neutral_50',
		shadow_drop = 'none',
		slider_color = '*primary_500',
		slider_color_dark = '*primary_600'
	)


def get_css() -> str:
	fixes_css_path = resolve_relative_path('uis/assets/fixes.css')
	overrides_css_path = resolve_relative_path('uis/assets/overrides.css')
	return open(fixes_css_path, 'r').read() + open(overrides_css_path, 'r').read()
